PROTON OTHER STARTER PROBLEM

2007 Proton Other • 175,000 miles

I have a 2007 Proton Arena 1.5i bakkie.I want to know what the length of the starters bolts is. One of my bolts is missing.I know its a 12mm bolt, but what is the actual length and what is the pitch size(1.25mm or 1.5mm).